How to connect to a database in Java

Working with byte[] data is common in Java applications — for example, when reading input streams, files, or network responses. In many cases, you may need to convert this binary data into a URI (Uni https://lnkd.in/dTEdrdeF

In modern Java applications, generating dynamic text is a common need — whether it’s building personalized email content, log messages, SQL queries, or configuration templates. Templating and placehol https://lnkd.in/d8_XFUgg

🚀 Modern Java Feature for Auto-Closing Database Connections 🤔 Are you still closing DB connections manually? Wait.... use Try-With-Resources, the Java’s smarter way to manage cleanup 👇 When you open a file, stream, or connection, you must close it to prevent leaks. ❌ Before Java 7, we did it the hard way 👇 BufferedReader reader = null; try {   reader = new BufferedReader(new FileReader("data.txt"));   System.out.println(reader.readLine()); } finally {  if (reader != null) reader.close(); } ✅ Then came Try-With-Resources — 🔥No finally block 👇 BufferedReader reader = new BufferedReader(new FileReader("data.txt")); try (reader) {  System.out.println(reader.readLine()); } 💡 How it works 👇 🔹Any class implementing AutoCloseable (like BufferedReader) can go inside try(). 🔹JVM automatically calls close() when the block ends, even on exceptions. 💬 What do you think ? #ModernJava #JavaDeveloper #CleanCode #ProgrammingTips #DevelopersCommunity #CodeSmarter

When you code in Java, the appeal of the work lies in the use of Generics. For example, when we have a class : public class Response<T> {   private ResponseError error;   private T response;      private Map<String, Object> additionalProperties; } Now, if we want to use this class as a response for calling an external service, how would we do it? @PostMapping(value = "${feignClients.example-url-address}",        produces = "application/json", consumes = "application/json") Response<exampleResponse> getInfo(@Valid @RequestBody exampleRequest request); In this case, if we don't define the response object or exampleResponse properly, we won't be able to map the response returned by the service correctly. The outer Response<> type has a field called response. so Jackson puts this part of the JSON into that field. So, if you define the service response class like this: private ٍExampleError error; private ExampleResponseData response; Therefore you get the error: Unrecognized field "someResponse" Since your API already wraps everything in an "error" and "response" field, you don’t need another Response<> wrapper in your Feign client.If your project uses a global Response<T> wrapper for all Feign clients, then you must change the generic type parameter so it matches the actual JSON structure. The "Unrecognized field" error is quite simple but useful. 🙂 In the comment, share your experiences in this area. 😊 #JSON #JACKSON #GENERICS #JAVA

Today I explored one of the most useful Java features — Try-With-Resources This feature automatically closes resources (such as files, readers, writers, and database connections) and prevents memory leaks. It makes code cleaner, safer, and more efficient. Here’s a simple example where I created a file on the Desktop and wrote data into it using Try-With-Resources package com.collection; import java.io.BufferedWriter; import java.io.FileWriter; import java.io.IOException; public class TrywithResouce {   public static void main(String[] args) {           String str = " happy codeing...";     String path = "C:\\Users\\Anish-bin-Shakil\\Desktop\\str.txt";     try (BufferedWriter br = new BufferedWriter(new FileWriter(path))) {       br.write(str);       br.newLine();     } catch (IOException e) {       e.printStackTrace();     }     System.out.println("data written successfully");   } } ✨ Key Benefits of Try-With-Resources: ✅ Automatic resource closing ✅ No need to call .close() manually ✅ Cleaner & safer code ✅ Reduces chances of memory/resource leaks ✅ Better exception handling I’m enjoying learning and improving my Java skills every day! #Java #TryWithResources #FileHandling #CodingInJava #LearningEveryday #SoftwareDevelopment #FreshersJourney #JavaDeveloper